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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f910e7d828cfb9160d0496aeb6e2273b0bb6af3d0428c2d4df509984f47773a' 
  AND token = 'Llt2R6+lPp1SlJnCDY7/jp10t92szyhFd86GvJwyPxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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