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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a11589ecf741f9217ff217eeba3e8ae243e893ae2fd101c6c71b7f6916d94bf5' 
  AND token = '5xKqKwgA7t01wzb3tYE45Y/uj02XP/9pAtmyZ6b2bx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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