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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb09f4c16568911265d6e6aed6540c33344e34c0c5a6a85899a670e1d9b7c6ca' 
  AND token = 'uNAsIFyBTVSd0K20i07Qd0vN4mckRqK9u9hPoMlfPCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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