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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fc8f94ceeb5b4d16a78de478e8d90795aaf513da7e4d6719ab057b665b2aa05' 
  AND token = '0eA93HAvrVxpquqenXLRKs8PSgwLF1ac1VnrGTRm1a4=' 
  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"
    }
  }
}