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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bbe71af426191823dd96c9a938b37e2b0c36c718b892ce744d7b59d5ea0eba0' 
  AND token = 'zePHmDsJlhojzCVIdrykN9J5rv7utsx1CtOcyiuEQ6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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