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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa318050cc3ace16ecf4a57e3a248e8f93ace6effca62909c3f0263763b47bc8' 
  AND token = 'x/bFgl1Oo0Yjy3O6G0r5fD5t7eio7VI2s2nqNdFjBFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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