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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49e03652336c3b2dda8e10b1a5dc929e8e2d115ed7e11aba66188ab98d2e4af8' 
  AND token = 'tfEJsgy5UVBr0TwaXdBtqfbvVbecEgy0ujM3I8A5q+w=' 
  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"
    }
  }
}