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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de2b3c9147f369cb0a1f287d2f23dacc6362d0ad61b4004b7bb7e2956ffa1dad' 
  AND token = '2Z2pito97y3So70hHDOFN2elKJtmUwUYNGrdQrpXCdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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