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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1112e2b3e51f120a6689c08aecb8c5ae6dbec30f2edfb1b05f3c55eff2188f82' 
  AND token = 'LbOqpjc7Qm8Py/0RJNx862tW3LgJmO4FPutoTRFzn4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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