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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '276fb0e07e2839da954c43e291863548cb5af8b6be9fcc63aa45bd2ee47545c6' 
  AND token = '4i99p1SVNSWHmvbqdspOJiBNgUa5tikmLQ0YtaKJ90o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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