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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff0ccae05c20e7f8aaa57d442f1ab3b2dfac63774a69fde79f957b3af8a617df' 
  AND token = 'fmCelqYJyu/Kkttdp6CRHD8Wd3unHslom9oOi3OCBfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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