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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee2235bd867843e25f418e273df6aeaf66bf0e812c122d2b4bacc2199d29d19f' 
  AND token = '3IoilCAOYkWrPIXPbs9Z/U0VTf89LmjMOoThgtb0u6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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