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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beea044b9f143f930eac694c093546dad2f51278d8c9b0c91e3d8a3288e8e03f' 
  AND token = 'BHKni8vEsbmiHuW5H+MGmLeEKhF8fKSEeOcYpwJl99M=' 
  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"
    }
  }
}