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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae5cf1c88e098ba6e636c2b6d3ea7fd320ff24743ecf6c689c8041fe86b6a7d6' 
  AND token = 'vs7aLKPiw1j076Wqp9qLWOA94rTsb3fC6W7/bXm94Z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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