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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de84e01a5939dbcf260d98b2642e45444910917aa131bd1f0e3ae79d69e1c1cd' 
  AND token = 'TsvwhS+zUzsbHm+hAxcleJYC369wi9w97seYsVbIz2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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