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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0ea2317331882b2cb072b5614dc17f2d39361137fdb3af16eaf8da25238f153' 
  AND token = 'lc+5+lAEW2xew+st284mzkFPEoWExKz63MIIbiDS1Cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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