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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f4bc84bb2dfa2bc08c06a827a4ea77cf1c1d5c7f0bf4c4abc148a64cbda142c' 
  AND token = 'dHcHRscDmsgzwc9HFE5ikvk9iLkaQJ36pYGksbjIX7A=' 
  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"
    }
  }
}