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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7948a67c956d0a7a8fad066170a9dc3c128ffa3904a23589b794ef1113f42daf' 
  AND token = 'MJM9nbBMjJ/3R/6jr0SbjMa5bfmVVdo+o8KV9B1veFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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