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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7dcbf8cf2a24081c22908c0438314f5e25c256a59283fd553788c3412f83e92' 
  AND token = '53w6nTicIB4QsF75BYRw/ShYlvXv8speW2uLQV9Cq0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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