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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e3161851534a24b7c742d3f4285d4297ebfdcd20305a63ce2cf1bcf5c007b54' 
  AND token = '2HAaNPbb0RkCRxAiXzpYng92uw8M5Yx4J5m8s2GzsMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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