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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '500f770b75ad4258db9ac60251795f06b2de5ab686b4bdd610c71451673e3e7c' 
  AND token = 'n+tVm5u8I3WMbprlXQxmzuE92g43CQixyValjAiUAZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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