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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c22a8ed2ac4959424f3e80c4a7350cf0e6f36c79d56384162b2b8ebb8dc110b' 
  AND token = 'ajtQynORQ/dGlo/B+7H64CMF7eb/QR9vUtFkeHM6mtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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