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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b8234e9868be8b364ad2cd8b7be6597979c2c07c04d2c91b2e905389d720edc' 
  AND token = '62SIMlJrlnRG6LlXrxd51mFK7yC/Gtc6GReh0wohj4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}