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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c1b6a3bbe86f8385e4d823d763ecfbec68f8810fb02cc5f416f4132d2d3fc16' 
  AND token = 'deJcgeDBP1J+muTR6M/mGzFt+OjX6W3LFkyWEg3KCto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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