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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '564e8b38d5610513ec6ca7648cc2019790850cc0e026f8acaa448c1a825e5a4b' 
  AND token = '7colNOsONZOE8l77B7SjUYP9w/lZnsonvD55G/+iLNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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