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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be35078370ab02848302c07a21cd8b5d64a9ad989999399a765ab258ab6ccf83' 
  AND token = 'A9meRvI1Dd5Pw4PFL9ERLj1JHC0uctQsy4+lyBlZw2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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