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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08947cdf748a8694b2409f7490ae9eb7a2b312819bbed23711eb738927d2be62' 
  AND token = 'rEY3IKz3HgnnudZ3L3KYXPpKDYVc/u/Pw2lVMMt9h78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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