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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce6412d290605e1093a4d88d094a2919d54aa9f473e9f91653cf98cdf6ff8d4d' 
  AND token = 'x5oGdVkePCAKQcMDEyWo8MN99y0eXJh1u383KNs0CrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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