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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9ce1bcd7b6ef312b0adc604b9198354583f65326b5621a5e890c2ae3bf1cd3e' 
  AND token = 'dZzQqX1RRhMYmQUe1hzj2h8qD/JvRf1EqoLFod3Rh4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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