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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b23bff57382269f0769991645a2c96e8a39753db63de95e3741c1d4807ba2894' 
  AND token = 'x8ff8DgWM48H5p/URj0pAduy/9a4pbQtktL0Bg/Thkk=' 
  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"
    }
  }
}