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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '040dbec6155d50c876d2e5be16fc4e30f096cf6925070bf79655c5fb669910ab' 
  AND token = 'HRl11S5hcn6A5YmOd9jtnIvmTn1YprFV+TNrPsJZlMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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