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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4f936531b0c19748d68a4e6d598a698a96e678b51647558a86cd2b3b633caa1' 
  AND token = 'F8/U5zMhhl/jeqG44pAseSIlXlQeJncEEsspPG99Upw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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