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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18f0550d7562503ddc1f1ae64e9932b61629a67f27dd2522689ba5e90a11ff48' 
  AND token = 'SHVoUa8zp2R2ZTke2Y2SPcHdWRI6/7eNT0zoDFeFD9I=' 
  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"
    }
  }
}