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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc87fc867359c1c0af1e6a600126241ee6a4be1c1983aa490323bb02065b2c69' 
  AND token = '1vQskLGyhr0FTNI7MC+hOswOLNvaVVsWMb0keHOeX5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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