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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48642e13ada5194613e2acd6acc5becdf37d17c193e3f293819d42c8c4d84e73' 
  AND token = 'EON/gpZMXs4AzF5sbXzngLM69OdkHsmMD55cN5o4Om8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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