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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67dfe74c14f2a98fb458741cc9fd4a08a8f11b6bc7728fdd3fcf061d05aaf138' 
  AND token = 'XAsNF10Vct75ryMUWTBUXq+06s5O/9MFyJPhd/x2vpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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