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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6576a85c9faac44b9a28cd50fe7064238b97e67ac9b4e463ebd8ef070bd96d1' 
  AND token = '39e3hRHLdiFe0JkFhIRIGnQfOxoL6ab5RfBK2w1zsNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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