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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '466b894b89f8714c90fdfd9056a3d06f1f587ef8c53d7e0e92e9f0ba67779623' 
  AND token = 'PeZyIn7nR7rSTWSgtiAyXpN9Wx8z5onLYDZ2QfzmMJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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