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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '928de893b3d8b1cf3ef1e3a4a54e241a495a2b21d7c27c8120f20c9885b4aa17' 
  AND token = '8sAPmXF0REBiLT8e0TQzwerttTub0UFDZfhaqHbEEk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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