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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0edc9cd018b4c79d2a9d7543acb1be470c5a8b2e0013961ddc281aefe26ee00b' 
  AND token = 'WxKQJkSSWGsrv3ULlYGA+C6eZKbM7uSb0mD5GRNJCos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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