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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e38e980d0912cfeeb8828dc19827d747d3a8b634a608fea8a6103c5414b67bab' 
  AND token = 'IPqYt4zkMI3dzA4kpzlC++d35SsyQk7JYWJRqGVY7eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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