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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51845878844a0af7574b00bfb5620af8caf59041d0c42e903eab31bcbc6eb9e4' 
  AND token = 'oEETXyTEG+TUWspw2/j7F32P4mkr5xA6Md/KUkmm520=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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