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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80750f5390ec339fd5e31de381324348571ceb678d5af5dbcb3941c1692b3168' 
  AND token = 'JZCxXb1kd4lHYRf75r1YorJohAh1wmBxGuLt6g9a7EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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