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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22cd5578d283888ba6e58988b33b3741d6c8b458e1582349999a20bf5a5f38db' 
  AND token = '/2Lr4pvaLHiLtFoe2sXeC0X0YiFTsgvPLbsofGTui98=' 
  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"
    }
  }
}