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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbf4f3a110640a72073535fa02e8a2a31fd31d4c092a9e16c52773fa2303aac8' 
  AND token = 'iW07uvSkuth9J1/KC7/svdNbxwOl8a40q8/Du2ZxWjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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