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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f14ea2ea68104f57dd047bf3dee463c756ead4e2ea03d4ce84aa3342d6ba59d8' 
  AND token = 'pEZNfn34/+4FMj+NfQDVIQb67NBrMOuUAym9UgtYqsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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