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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e38c7144b01b4ee3dddb1328c0274fa75ec6dc1db3979b0e7057b971367ff883' 
  AND token = 'YLkMuYT+u+fsNltHWIXC3EdKyV367oLsxR7fMBXUhDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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