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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a919bd05a4b420e0bc5da1f4e70d5e28be82cffe5835e551bb04aa7d8d09e297' 
  AND token = '7BhBJ/I+Z5FWP56WUMaXsfPJOYMUKDivflM4A5nwq5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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