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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d9fc1e7c99821495e82d416ceefe4068cc5f1f29fb66bad270a59b6d8a5169d' 
  AND token = 'Y8OwsescqdE1dx9IQrHGIiinQ/jIjnFSI1rYPROtt1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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