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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c31ec7a024637a153465d52e58075d0190f8ffb3895733c17839c3cb182a47d' 
  AND token = '/oh8iNPHYuL3bnF8YBLzcZDHdNv2DggFEakpfMkDqYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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