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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43af91a9c978103a3fd2ec4c62d0aa89ad56d2c942aefffb29f8d9ebbdd0c991' 
  AND token = '+M0QmySl7THbFCLUBNV/f0b79HbsWnfiuaLUvcSsPN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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