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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f28a31a89045a1aa8a74416df03dcf6e02938d9f0ee4cb9b50077e628dd7b97f' 
  AND token = '2/xIWxNTtb/IulQY+Lj7rdRnQxKcOavjIN5NTuERzw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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