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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '401674d2a65ec069e12b254eed133a9ec0b97edd4874ccd4d9872839c6a75074' 
  AND token = 'PlQL5+ehSsh0aaa5Sp/CFL/Knv50MWkAxzNmUXmD2n4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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