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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f467a6067cf89839f34f02e2ef65df5b4ab586336a064dd15e34cf06547dc3' 
  AND token = 'F39Bot16izQDCQHMXr73Jh4u5m8Df8yiAl6+J8TE/xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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