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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1bddd1d8c4e3877577e14e072351b92601312681fc287699955b0bbb44661b9' 
  AND token = '8bCayL80U+fWo6e+au93ilBITyvmRsQQRe9f5qZaCTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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