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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '126ed5b32b3b356416f4a9a572456ced7bcddf3cf82569200a6323fd96d720a1' 
  AND token = 'dY7ttYtGlYZtaIEJDTx0nWxxFHdRyMXd3nRv72GWwAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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